The cutters of mowing-machines



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D.. W. JAMESON, OF AWARREN, OHIO. Leners Patent No. 83,067, dated caoba 13, 186s.

IMPROVEMENT IN MACHINES FOR GR.`l1\`lDI1l'G THE` CUTTERS OF MOWING-MACHINES The Schedule referred to in these Letters Patent and making of the lame.

To all whom it 'ma/y concern Be it known that I, D. W. JAMEsoN, of Warren, in the county of Trumbull, and State of Ohio, have invented a certain new and useful Improvement in Machine for Grinding Harvester-Cutters; and I hereby declare that the following is a full and complete description of the same, reference being had to the accompanying drawings, making a part of this specification, in which- Figure l is a side view of the machine.

Figure 2, a view of the top.

Figure 3, an end view.

Like letters of reference refer several views.

This invention relates to a device in connection with an ordinary grindstone, whereby harvester-cutters-are held to said stone while being ground. y

In iig. l, A represents a wooden frame, in-whieh is .hung a grindstone, B, on the shaft C. To one end of said ame is secured, by the thumb-screws D, a bridgetree, E. To each end of said bridge-tree is pivoted a standard, F, between andin which is hung a frame, G, which may be moved upward and downward in the standards, in slots cut in -said standards for that purpose, and secured at any one point by the thumbscrews I. To the lower side of the frame G are secured to like parts in the .l the sickle or cutters H, and which Aare fastened to the bar of the frame by the thumb-screws or hooks J.

The practical operation of this machine is as follows, viz: The gang of cutters on being secured to the rail of the frame, is then adjusted to the stone, so as to bring the basil of the cutting-edge and angle of the section in proper relation thereto, which is easily and quickly done by turning the bridge-tree at such angle to the face of the stone, that the corner shall run between the sections, as shown in iig. 2, in which it will be seen that the basil of the edge can be brought to the face of the stone at whatever angle it may be, and thus held securely while being ground.

This being done, the screwsare then slackened, and

the gang slipped along, until the second section comes in place as was the first. llhis being ground, the gang is again moved as before, and so on until one bias of each section is ground.` A

The bias on the opposite angle of the section is then brought in proper relation to the stone, by reversing the direction of the budge-tree, as indicated by the lines a, tlg. 2. The operation of grinding is then repeated, as above described.

It will be observed that as the angle of each section rests upon the stone, its contact with it is only at one point, in consequence of the stone being round; hence, unless the section is Inoved so as to change the point of contact, the edge of the section will be ground concaving',-instead of straight, as it should be.

Now, in order to bring the entire length of the basil to the face of the stone without grinding it concaving, the frame G is held loosely in the standards, and therefore can be vibrated. The standards also being pivoted to the ends of the bridge-tree, allow them andthe frame to move toward and from the stone. Y

By this combined movement, it will be obvious that the basil of the section can be applied to the stone its entire length, simply by vibrating the frame, which, at the same time, moves towards and 'om the stone, as the point of contact may determine; hence, the section can be 4ground so that each edge shall be stlaight.

The apparatus may be shifted from one end of the frame to the other, in case there is but one crank to the stone.

By the use of this apparatus, much hard laboris saved to those grinding Y narily done, are held in the hands to the stone. The grinding is also much better done, as the angle of each section is preserved, and the bias of the cutting-edge alike in each section. y

vWhat I claim as my invention, and desire to secure by Letters Patent, is-

The standards or arms F, hinged or pivoted to the bri ge-tree E, in combination with the adjustable 'ame G, arranged and operating conjointly, as and for the purpose substantially as set forth.

Witnesses:y

W. H. BURRIDGE, J. H. BURRJDGE.

the cutters, which, as ordi-A 

